加密广播的密钥管理优化

本文提出了一个四层密钥分层管理模型,改进了逻辑密钥层次LKH树,使其适应成员变更频繁的大型动态系统,并采用改进LKH树方案优化了数字电视广播系统的密钥管理模块。经实例分析,将优化后的系统与一般广播系统对比,对比后的结果证明本方案缩减了组管理器的密钥存储开销并降低了系统通信开销。

Optimizing Key Management for Broadcast Encryption

A four hierarchy model of key distribution management has been proposed in this paper. For adapt to large dynamic system that the member frequency change, the Logic Key Hierarchy (LKH) tree has been improved. Furthermore, the author has optimized the key management module of the digital video broadcasting system by advanced LKH scheme. Compare the exiting broadcasting system with the optimized system, the results show that this scheme cut down the key storage spending of the group controller rea- sonably as well as increase the communication spending properly.